SOLUTION: Carlos's average speed for driving a 4-hour trip was 50mph. During the first two hours, he drove 60mph. What was his average driving speed for the last 2 hours?

Question 991991: Carlos's average speed for driving a 4-hour trip was 50mph. During the first two hours, he drove 60mph. What was his average driving speed for the last 2 hours?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
.
To average 50mph for 4 hours he drove:
.
(50mph)(4hrs)=200 miles
.
During 2 hours at 60mph:
(60mph)((2hrs)=120 miles
.
During the last 2 hours he drove:
200 mi-120 mi=80 mi
.
His average speed was:
80mi/2hr=40mi/hr
.
ANSWER: His average speed the last 2 hours was 40 miles per hour.
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